kadai2/su-san/cover.html


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				<option value="file0">github.com/gopherdojo/dojo7/kadai2/su-san/image.go (93.8%)</option>
				
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				<span>not tracked</span>
			
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		<pre class="file" id="file0" style="display: none">// Package image は画像のフォーマットを変換するためのパッケージです。
package image

import (
        "image"
        "image/gif"
        "image/jpeg"
        "image/png"
        "os"
        "path/filepath"
)

var supportedFormats = map[string]bool{"jpg": true, "jpeg": true, "png": true, "gif": true}

func SupportedFormat(ext string) bool <span class="cov8" title="1">{
        // ドット始まりの拡張子ならドットを削除する
        if len(ext) &gt; 0 &amp;&amp; ext[0] == '.' </span><span class="cov8" title="1">{
                ext = ext[1:]
        }</span>
        <span class="cov8" title="1">_, ok := supportedFormats[ext]
        return ok</span>
}

// ConvExts は変換対象のフォーマットと変換先のフォーマットを表す構造体です
type ConvExts struct {
        InExt, OutExt string
}

// SupportedFormats は指定フォーマットが対応しているか確認するメソッドです
func (c *ConvExts) SupportedFormats() bool <span class="cov8" title="1">{
        return SupportedFormat(c.InExt) &amp;&amp; SupportedFormat(c.OutExt)
}</span>

// NewConvExts は変換対象のフォーマットと変換先のフォーマットを表す構造体です
func NewConvExts(in, out string) ConvExts <span class="cov8" title="1">{
        if in == "" </span><span class="cov8" title="1">{
                in = "jpg"
        }</span>

        <span class="cov8" title="1">if out == "" </span><span class="cov8" title="1">{
                out = "png"
        }</span>
        <span class="cov8" title="1">return ConvExts{InExt: in, OutExt: out}</span>
}

// FmtConv は指定されたフォーマットからフォーマットへ変換する関数です
func FmtConv(f *os.File, exts ConvExts) (err error) <span class="cov8" title="1">{

        var img image.Image
        var decodeErr error

        switch exts.InExt </span>{
        case "jpeg", "jpg":<span class="cov8" title="1">
                img, decodeErr = jpeg.Decode(f)</span>
        case "png":<span class="cov8" title="1">
                img, decodeErr = png.Decode(f)</span>
        case "gif":<span class="cov8" title="1">
                img, decodeErr = gif.Decode(f)</span>
        }

        <span class="cov8" title="1">if decodeErr != nil </span><span class="cov0" title="0">{
                return decodeErr
        }</span>

        <span class="cov8" title="1">path := f.Name()
        pathWithoutExt := path[:len(path)-len(filepath.Ext(path))+1]
        outputFile, err := os.Create(pathWithoutExt + exts.OutExt)
        if err != nil </span><span class="cov0" title="0">{
                return err
        }</span>
        <span class="cov8" title="1">defer func() </span><span class="cov8" title="1">{
                cerr := outputFile.Close()
                if err == nil </span><span class="cov8" title="1">{
                        err = cerr
                }</span>
        }()

        <span class="cov8" title="1">switch exts.OutExt </span>{
        case "jpeg", "jpg":<span class="cov8" title="1">
                err = jpeg.Encode(outputFile, img, nil)</span>
        case "png":<span class="cov8" title="1">
                err = png.Encode(outputFile, img)</span>
        case "gif":<span class="cov8" title="1">
                err = gif.Encode(outputFile, img, nil)</span>
        }

        <span class="cov8" title="1">return</span>
}
</pre>
		
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